TC Electronic Radar Meter Bundle TDM User Manual
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LM5/LM5D & AM6 -TDM
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OBS Indicator
Sets the conditions for the OBS indicator to light up. Turn it off, if you don’t want
warnings.
Time Reference
Time Reference can take two values: “Actual Computer Time” or “Program Time”. The
first is synchronized to the realtime clock of the computer, the latter to when a new
measure was started, i.e. when the “run” key was pressed. Note: The meter history
resets when you switch between Time Reference settings.
Radar Speed
Radar Speed controls how long time each radar revolution takes. Select from 1 minute
to 24 hours. You may “zoom” between the settings, as long as the history isn’t reset.
Pressing the “X” key, or changing the Time Reference, resets the meter and descriptor
history.
Radar Resolution
Sets the difference in loudness between each concentric circle in the Radar between
3 and 12 dB. Choose low numbers when targeting a platform with a low dynamic
range tolerance. You may “zoom” between the settings, as long as the history isn’t
reset. Pressing the “X” key, or changing the Time Reference, resets the meter and
descriptor history.
Loudness Standard
The Program Loudness measurement in LM5D is always based on the Leq(K) weighted
model. However, since the introduction in 2006, the ITU-R BS.1770 standard has
been updated with a relative gating function, improving the model’s cross-genre
normalization capabilities.
The Loudness Standard should therefore normally be set to “ITU-R BS.1770-2” for
compliance with the ITU standard, with EBU R128, with TR-B32 and with ATSC A85.
This setting applies a relative gate at -10 LU when computing the Loudness Range
number.
Two legacy settings are also provided: “Leq(K)”, reflecting the original BS.1770
measurement without gating, and “Center of Gravity” which was available in LM5D
version 1. Center of Gravity makes use of a relative gate at -20 LU.
Only Program Loudness is influenced by the Loudness Standard setting while
Loudness Range, Momentary Loudness and Short-term loudness remain unaffected.
Note how a meter reset, flushing the loudness history, is performed when this
parameter is changed.